STANAG 4370 environmental testing (AECTP-100 and AECTP-600)

What it is

STANAG 4370 is a NATO Standardization Agreement, currently Edition 8, dated 4 June 2025. It is not a technical specification. It is the agreement by which NATO nations commit to ratify and implement two Allied Environmental Conditions and Test Publications: AECTP-100, Edition F, and AECTP-600, Edition C. The test methods, environmental conditions and severities that a reader usually wants live inside those two publications, not inside STANAG 4370 itself. Read on its own, STANAG 4370 requires almost nothing of a supplier directly. Its obligations run to nations, and it reaches a contractor only indirectly, once a nation has implemented it and a contract or tender names AECTP-100 or AECTP-600.

Who it binds, and how

STANAG 4370 is explicit that it binds nations rather than organisations. Its own implementation clause says the STANAG "is considered implemented when a nation has issued the necessary orders and instructions putting the contents of this agreement into effect." Ratification and implementation are two separate steps, and the document invites nations that have not yet reported their position to "advise the NSO of their intention regarding its ratification and implementation." So "is STANAG 4370 mandatory" has no single answer: it depends on whether a given nation has ratified and implemented it, and, for a supplier, on whether a specific contract invokes AECTP-100 or AECTP-600 as a result. Once a nation has implemented STANAG 4370, it also expects organisations within that nation to "have the processes and resources to support the conduct of environmental testing, across all stages of the lifecycle acquisition process," and to support the NATO working group (AC/327 LCMG Working Group 6) that maintains the AECTPs.

What the agreement actually commits nations to

Under "Agreement," participating nations agree to implement AECTP-100, Edition F, and AECTP-600, Edition C. Under "Implementation of the agreement," nations are required to promote the use of the AECTPs in the contracting, verification and assessment of defence materiel, make sure national test and assessment programmes incorporate the AECTP guidelines, quantify the gap between their own environmental conditions and NATO's agreed ones, and work towards harmonising national standards with the AECTPs. None of this is written as a duty on a supplier; it is a duty on the nation and on the national and NATO bodies that run test and acquisition programmes.

A cover agreement, not the test method

The distinction matters because a reader who only has STANAG 4370 in hand does not yet have anything to test against. The actual environmental conditions and test procedures are in AECTP-100 and AECTP-600. STANAG 4370's own text frames its job as accepting "the 100 and 600 series of the Allied Environmental Conditions and Test Publications (AECTP) which give nations guidelines on the management of environmental testing of defence materiel, using agreed environmental conditions and standardized environmental testing procedures." Everything a test engineer needs sits behind that acceptance, not in the promulgation letter itself.

Why STANAG 4370 covers less than it used to

Edition 8 supersedes Edition 7 (28 November 2019). The document's own "Additional information" explains that the AECTP 100, 200, 230, 240, 250, 300, 400, 500 and 600 series were formerly all covered by STANAG 4370, which "has from this point been split into four STANAGs": 4370 itself, now limited to AECTP-100 and AECTP-600; STANAG 4866, covering AECTP-230 and AECTP-300; STANAG 4867, covering AECTP-240 and AECTP-400; and STANAG 4868, covering AECTP-250 and AECTP-500. AECTP-200 has been cancelled outright, its content folded into AECTP-100, 230, 240 and 250, and AECTP-100 itself has been updated and amended for this edition. A reader who remembers STANAG 4370 covering the whole AECTP family is remembering an earlier edition; today it covers two of the nine series, with the rest split across its three siblings.

What it does not cover

STANAG 4370 names no test method, no severity level and no pass or fail criterion of its own - that detail lives entirely in AECTP-100 and AECTP-600. It also names no assessment or certification scheme: its only stated check is that the STANAG itself "is to be reviewed in accordance with AAP-03," which is a periodic review of whether the agreement is still current, recorded in the NSDD, not an audit of any organisation or product. Two related NATO packaging documents are mentioned as "other related documents" rather than as part of the agreement itself: STANAG 4340 (AEPP-3, standard packaging test procedures) and STANAG 4434 (AEPP-2, packaging for materiel susceptible to electrostatic discharge). Neither is a requirement of STANAG 4370; both are pointers to standards a defence packaging programme is likely to meet alongside it.

Standards it references

• STANAG 4866Background
• AECTP-230Background
• STANAG 4867Background
• AECTP-240Background
• STANAG 4868Background
• AECTP-250Background
• STANAG 4340Background
• AEPP-03Background
• STANAG 4434Background
• AEPP-02Background
• AECTP-300Background
• AECTP-400Background
• AECTP-500Background
• AAP-03Background